This is'nt the 17.02.81 show known as 'Freddie was Here'- I have just compared the 2.
I think this show is the 13.02.81 known as 'Japanese Heroes'.
The sound quality of this show that I have just downloaded is better than the 17.02.81 I downloaded a while ago.
Hope this helps- mind you i could be wrong but this would be the best guess at this stage.
Cheers Flashalive